altera_jtag_uart_fdt.c revision 266152 
1/*-
2 * Copyright (c) 2012 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/10/sys/dev/altera/jtag_uart/altera_jtag_uart_fdt.c 266152 2014-05-15 16:11:06Z ian $");
33
34#include <sys/param.h>
35#include <sys/bus.h>
36#include <sys/condvar.h>
37#include <sys/conf.h>
38#include <sys/bio.h>
39#include <sys/kernel.h>
40#include <sys/lock.h>
41#include <sys/malloc.h>
42#include <sys/module.h>
43#include <sys/mutex.h>
44#include <sys/rman.h>
45#include <sys/systm.h>
46#include <sys/taskqueue.h>
47
48#include <machine/bus.h>
49#include <machine/resource.h>
50
51#include <geom/geom_disk.h>
52
53#include <dev/altera/jtag_uart/altera_jtag_uart.h>
54
55#include <dev/fdt/fdt_common.h>
56#include <dev/ofw/openfirm.h>
57#include <dev/ofw/ofw_bus.h>
58#include <dev/ofw/ofw_bus_subr.h>
59
60/*
61 * FDT bus attachment for Altera JTAG UARTs.
62 */
63static int
64altera_jtag_uart_fdt_probe(device_t dev)
65{
66
67	if (!ofw_bus_status_okay(dev))
68		return (ENXIO);
69
70	if (ofw_bus_is_compatible(dev, "altera,jtag_uart-11_0")) {
71		device_set_desc(dev, "Altera JTAG UART");
72		return (BUS_PROBE_DEFAULT);
73	}
74	return (ENXIO);
75}
76
77static int
78altera_jtag_uart_fdt_attach(device_t dev)
79{
80	struct altera_jtag_uart_softc *sc;
81	int error;
82
83	error = 0;
84	sc = device_get_softc(dev);
85	sc->ajus_dev = dev;
86	sc->ajus_unit = device_get_unit(dev);
87	sc->ajus_mem_rid = 0;
88	sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
89	    &sc->ajus_mem_rid, RF_ACTIVE);
90	if (sc->ajus_mem_res == NULL) {
91		device_printf(dev, "couldn't map memory\n");
92		error = ENXIO;
93		goto out;
94	}
95
96	/*
97	 * Interrupt support is optional -- if we can't allocate an IRQ, then
98	 * we fall back on polling.
99	 */
100	sc->ajus_irq_rid = 0;
101	sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
102	    &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
103	if (sc->ajus_irq_res == NULL)
104		device_printf(dev,
105		    "IRQ unavailable; selecting polled operation\n");
106	error = altera_jtag_uart_attach(sc);
107out:
108	if (error) {
109		if (sc->ajus_irq_res != NULL)
110			bus_release_resource(dev, SYS_RES_IRQ,
111			    sc->ajus_irq_rid, sc->ajus_irq_res);
112		if (sc->ajus_mem_res != NULL)
113			bus_release_resource(dev, SYS_RES_MEMORY,
114			    sc->ajus_mem_rid, sc->ajus_mem_res);
115	}
116	return (error);
117}
118
119static int
120altera_jtag_uart_fdt_detach(device_t dev)
121{
122	struct altera_jtag_uart_softc *sc;
123
124	sc = device_get_softc(dev);
125	KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
126	    __func__));
127
128	altera_jtag_uart_detach(sc);
129	bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
130	    sc->ajus_irq_res);
131	bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
132	    sc->ajus_mem_res);
133	return (0);
134}
135
136static device_method_t altera_jtag_uart_fdt_methods[] = {
137	DEVMETHOD(device_probe,		altera_jtag_uart_fdt_probe),
138	DEVMETHOD(device_attach,	altera_jtag_uart_fdt_attach),
139	DEVMETHOD(device_detach,	altera_jtag_uart_fdt_detach),
140	{ 0, 0 }
141};
142
143static driver_t altera_jtag_uart_fdt_driver = {
144	"altera_jtag_uart",
145	altera_jtag_uart_fdt_methods,
146	sizeof(struct altera_jtag_uart_softc),
147};
148
149DRIVER_MODULE(altera_jtag_uart, simplebus, altera_jtag_uart_fdt_driver,
150    altera_jtag_uart_devclass, 0, 0);
151